FreeSign

FreeSign provides a free in-browser electronic signature service that never uploads PDFs. It hashes documents locally, captures signer intent with OTP, issues per‑user certificates, and adds OpenTimestamps proof, delivering a standard PAdES‑B‑T signed PDF verifiable in Adobe Reader, OpenSSL and pyHanko. The platform supports 29 languages, requires no account, and runs entirely in the browser, targeting EU eIDAS AES and US ESIGN/UETA compliance.

FreeSign publishes 2 API contracts indexed on the APIs.io network: Consent API and Envelopes API. Tagged areas include E-Signature, FreeSoftware, BrowserApp, and Open Source.

The FreeSign catalog on APIs.io includes 1 Spectral governance ruleset.

FreeSign’s developer surface includes support, pricing, documentation, and 17 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

34.6/100 thin Agent 19/100 agent aware Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessFreemiumOpen⚡ Free to try

1 published contract 1 MCP Servers

E-Signature FreeSoftware BrowserApp Open Source

Kin Score

Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 34.6/100 · thin

Contract Quality 8.8 / 21

Developer Ergonomics 2.4 / 17

Access Clarity 6.9 / 17

Operational Transparency 1.0 / 11

Contract Governance 3.2 / 10

Discoverability 5.7 / 9

Regulatory Posture 3.8 / 15

Agent readiness — 19/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey) Ask about this →
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented) Ask about this →
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0 Ask about this →
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented) Ask about this →
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link Ask about this →
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document Ask about this →

9 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Developer Ergonomics scores 14.3 — up to +17.1 composite points Ask about this →
Contract Quality scores 41.6 — up to +14.6 composite points Ask about this →
Access Clarity scores 40.4 — up to +11.9 composite points Ask about this →

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Not sure how this applies to your stack? Ask about any one item. Kin Lane reads every question, looks at your profile and your situation, and replies with what a fix would take — scoped to that one area, priced up front, yours whether you ship it or not. Ask a question →

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/free-sign-com/apis.yml: open an issue on github.com/api-evangelist/free-sign-com to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Standards implemented 2

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

Model Context Protocol (MCP)

measured — observed by APIs.io (documented)

OpenAPI

measured — observed by APIs.io (published)

APIs 2

Individual APIs this provider publishes, each with its own machine-readable definition.

FreeSign Consent API

The Consent API from FreeSign — 1 operation(s) for consent.

FreeSign Envelopes API

The Envelopes API from FreeSign — 1 operation(s) for envelopes.

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

FreeSign MCP Server

Remote MCP server at free-sign.com.

MCP SERVER

FreeSign API pricing

Prices published by FreeSign, read 2026-11-09 from free-sign.com/pricing.

Plan	Price
Free	€0/ forever
Enterprise	Custom — priced per organization, on request

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

FreeSign Plans Pricing

2 plans

PLANS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs. Counts are the severity each rule declares, not results of running them.

FreeSign API Rules

22 rules · 20 error-severity 1 warn-severity 1 info-severity

SPECTRAL

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

FreeSign Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

FreeSign Vulnerability Disclosure

security.txt · contact published

SECURITY

Agentic Access (API Evangelist recommendations) 1

Recommended x-agentic-access execution contracts for AI agents.

FreeSign Agentic Access

2 operations · 1 acting

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

LLMsTxt

MCPServer

WellKnown

Design & Contract 3

Pagination, idempotency, versioning, errors, and events

Spectral

Spectral

ErrorCatalog

ErrorCatalog

Conformance

Conformance

Access & Security 5

Authentication, authorization, and security posture

SecurityTxt

SecurityTxt

TrustCenter

TrustCenter

Security

Security

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 3

Pricing, plans, and the legal terms of use

Plans

Plans

PrivacyPolicy

PrivacyPolicy

Pricing

Pricing

Company 1

The organization behind the API

Website

Website

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: free-sign-com
name: FreeSign
accessModel:
  pricing: freemium
  onboarding: open
  trial: false
  try_now: true
  public: true
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Open access
  confidence: low
  source:
  - plans
  - security
  generated: '2026-11-13'
  method: derived
image: https://free-sign.com/og-image.png
description: FreeSign provides a free in-browser electronic signature service that never uploads PDFs. It hashes documents
  locally, captures signer intent with OTP, issues per‑user certificates, and adds OpenTimestamps proof, delivering a standard
  PAdES‑B‑T signed PDF verifiable in Adobe Reader, OpenSSL and pyHanko. The platform supports 29 languages, requires no account,
  and runs entirely in the browser, targeting EU eIDAS AES and US ESIGN/UETA compliance.
url: https://artifacts.apis.io/free-sign-com/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-09 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-11-08'
modified: '2026-11-08'
tags:
- E-Signature
- FreeSoftware
- BrowserApp
- Open Source
tags_raw:
- ElectronicSignature
- FreeSoftware
- BrowserApp
- NoAccount
- OpenSource
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/free-sign-com-agentic-access.yml
- type: Plans
  url: plans/free-sign-com-plans-pricing.yml
- type: Spectral
  url: rules/free-sign-com-rules.yml
- type: ErrorCatalog
  url: errors/free-sign-com-problem-types.yml
- type: Conformance
  url: conformance/free-sign-com-conformance.yml
- type: LLMsTxt
  url: llms/free-sign-com-llms.txt
- type: MCPServer
  url: mcp/free-sign-com-mcp.yml
- type: SecurityTxt
  url: well-known/free-sign-com-security.txt
- type: WellKnown
  url: well-known/free-sign-com-well-known.yml
- type: Hosts
  url: hosts/free-sign-com-hosts.yml
- type: Vendors
  url: vendors/free-sign-com-vendors.yml
- type: TrustCenter
  url: https://free-sign.com/trust
- type: Support
  url: https://free-sign.com/support
- type: Security
  url: https://free-sign.com/.well-known/security.txt
- type: PrivacyPolicy
  url: https://free-sign.com/privacy
- type: Pricing
  url: https://free-sign.com/pricing
- type: Documentation
  url: https://free-sign.com/guides/
- type: VulnerabilityDisclosure
  url: security/free-sign-com-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/free-sign-com-domain-security.yml
- type: Website
  url: https://free-sign.com/
apis:
- aid: free-sign-com:free-sign-com-consent-api
  name: FreeSign Consent API
  description: The Consent API from FreeSign — 1 operation(s) for consent.
  humanURL: https://free-sign.com/docs
  baseURL: https://free-sign.com
  tags:
  - Consent
  properties:
  - type: OpenAPI
    url: openapi/free-sign-com-consent-api-openapi.yml
- aid: free-sign-com:free-sign-com-envelopes-api
  name: FreeSign Envelopes API
  description: The Envelopes API from FreeSign — 1 operation(s) for envelopes.
  humanURL: https://free-sign.com/docs
  baseURL: https://free-sign.com
  tags:
  - Envelopes
  properties:
  - type: OpenAPI
    url: openapi/free-sign-com-envelopes-api-openapi.yml
x-enrichment:
  date: '2026-11-09'
  status: enriched
  artifacts_added: 19
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

FreeSign API — frequently asked questions

Does FreeSign have an API?

Yes. APIs.io lists 2 APIs from FreeSign, including FreeSign Consent API and FreeSign Envelopes API.

Is there an OpenAPI specification for the FreeSign API?

Yes. APIs.io indexes 2 OpenAPI specifications for FreeSign, each linked for download from this page.

How much does the FreeSign API cost?

FreeSign publishes its prices; its Free plan is €0/ forever as of 2026-11-09. APIs.io lists 2 pricing plans for FreeSign, with each plan's price, limits and inclusions under Pricing on this page.

Does FreeSign have an MCP server?

Yes. APIs.io lists 1 MCP server for FreeSign: Remote MCP server at free-sign.com.

Is the FreeSign API ready for AI agents?

FreeSign has a Kin Score of 34.6 out of 100 (thin) and an Agent Readiness score of 18.9 (agent-aware), scored by API Evangelist on 2026-11-13.

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